Wire the device requisition parameter for enterprise enrollment.

chrome/browser/policy/proto/cloud/device_management_backend.proto

Index: chrome/browser/policy/proto/cloud/device_management_backend.proto
diff --git a/chrome/browser/policy/proto/cloud/device_management_backend.proto b/chrome/browser/policy/proto/cloud/device_management_backend.proto
index 0d42509b2bfd33e38a6c22192099f8df9d396981..4f414bd341e28d7a425de2fac38a9c6826ff5cc0 100644
--- a/chrome/browser/policy/proto/cloud/device_management_backend.proto
+++ b/chrome/browser/policy/proto/cloud/device_management_backend.proto
@@ -44,6 +44,11 @@ message DeviceRegisterRequest {
   // that the client is to be enrolled in the correct mode.
   // Defaults to false when not present.
   optional bool auto_enrolled = 5;
+
+  // Indicates a requisition of the registering entity that the server can act
+  // upon. This allows clients to pass hints e.g. at device enrollment time
+  // about the intended use of the device.
+  optional string requisition = 6;
 }
 
 // Response from server to device register request.